Which causes genetic variations and can result in different alleles? predation rate
random mutations
competition
environmental changes

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Nonpoint source pollution is difficult to control because it

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88